Method for comprehensively treating shallow silt lakes through Sudoku partition

Abstract

The invention relates to the technical field of lake treatment, in particular to a method for comprehensively treating a shallow silt lake through Sudoku partition, which comprises the following steps: S1, engineering investigation and Sudoku partition planning; s2, constructing a multifunctional sand blowing bag cofferdam and synchronously constructing an ecological wetland; s3, dredging and dredging in turn in different areas and recycling and classifying the sludge; s4, constructing a cross-lake traffic network based on the cofferdam roadbed; and S5, medium and long term integrated development planning and space function expansion are carried out. According to the scheme, a Sudoku partition treatment concept is introduced, a huge and complex lake desilting engineering system is decomposed into a plurality of standardized units which can be independently and sequentially implemented, and a permanent composite structure with the functions of mud blocking, a roadbed and an ecological base is constructed by adopting a sand blowing bag cofferdam technology. According to the method, nearby and partitioned in-situ stacking and classified resource utilization of desilting sludge are achieved, and the situation that a traditional desilting project is high in cost and tedious in working procedure is changed essentially.

Description

Technical Field

[0001] This invention relates to the field of lake management technology, and in particular to a method for comprehensive management of shallow, silted lakes by using a nine-square grid system. Background Technology

[0002] Shallow, silted lakes, as important components of surface water resources and ecosystems, play a crucial role in regional water supply, climate regulation, biodiversity conservation, and economic development. However, with industrialization and urbanization, the influx of large amounts of external pollutants has led to severe sedimentation and eutrophication in many shallow lakes. This not only reduces the effective storage capacity of the lake basins and weakens flood control and regulation capabilities, but also becomes a continuous source of pollution within the water bodies, causing frequent algal blooms, aquatic ecosystem degradation, and water quality risks. Their comprehensive management has become a global environmental challenge.

[0003] Traditional mainstream technologies for treating sediment in shallow, silted lakes typically involve using environmentally friendly cutter suction dredgers to excavate the sediment, then transporting it via pipeline to a fixed location on shore. After solidification and dewatering, the sediment is formed into cakes, which are then transported to off-site landfills or disposed of. This method has significant limitations: the separation of dredging and subsequent disposal leads to high engineering costs and enormous energy and resource consumption; the difficulty in selecting solidification sites, the long-distance transport and storage of sediment occupying large amounts of land and easily causing secondary environmental risks; and the singular treatment model, usually focusing only on sediment removal itself, fails to effectively coordinate with long-term development needs such as improving regional transportation infrastructure, reshaping the ecological landscape, and expanding land space, thus limiting the overall benefits of the project and making it difficult to meet the requirements of modern lake basin system governance and green development. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for the comprehensive management of shallow, silted lakes through a nine-square grid partitioning system, thereby solving the technical problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A method for comprehensive management of shallow, silted lakes using a nine-square grid system includes the following steps: S1: Conduct an engineering survey of the target lake to obtain data on the distribution and pollution status of bottom sediment, and based on this data, plan the water area of ​​the lake that needs to be treated into nine core blocks, and set up cofferdams using a combination of virtual and real layout methods. S2: Construct a sandbag cofferdam at the planned solid cofferdam axis, and at the same time build an ecological wetland system outside the cofferdam; S3: Dredging operations are carried out according to the principle of zoned and grid-skipping construction. The dredged silt is transported to the area enclosed by the cofferdam of the corresponding block, and the silt is classified, disposed of and utilized as a resource. S4: Use the consolidated solid sandbag cofferdam as the roadbed to construct a cross-lake transportation network; S5: To develop a medium- to long-term integrated development plan for the reservoir capacity, land area, and transportation network formed after the remediation, and to expand the ecological, cultural tourism, and industrial functions.

[0006] In one possible implementation, in step S1, the layout of combining physical and virtual elements is specifically as follows: physical cofferdams form the boundaries of each core block, water flow channels are reserved between adjacent physical cofferdams, and the physical cofferdams are planned as permanent structures that combine the functions of silt retention during the dredging period and the function of roadbed for traffic in the later period.

[0007] In one possible implementation, in step S2, the sandbag cofferdam is constructed using a layered dredging process, with the raw materials taken from the rich sand layer at the bottom of the lake, and the top width of the cofferdam... To meet the roadbed width requirements for later stages, the cofferdam crest elevation... According to the lake's normal water level And wind and wave conditions settings.

[0008] In one possible implementation, in step S2, the ecological wetland system is constructed outside the solid cofferdam, using qualified soil generated from dredging to fill the area, and aquatic plants are planted within the wetland to purify the water.

[0009] In one possible implementation, step S3 specifically includes: conducting on-site testing of the dredged soil, using qualified soil for wetland construction, and centrally stockpiling unqualified silt in a designated area inside the cofferdam, and covering the surface of the stockpiled area with a clean covering layer.

[0010] In one possible implementation, in step S4, constructing a cross-lake transportation network specifically includes: laying a road surface structure layer on top of a solid cofferdam to form a road, and connecting the cofferdam with the lake shore and water flow channels connecting adjacent cofferdams through bridges or tunnels to form a main transportation route through the lake.

[0011] In one possible implementation, the transportation network comprises a system of multiple parallel roads, wherein at least one road is planned as a fast artery and another road is planned as a tourist and leisure road.

[0012] In one possible implementation, in step S5, the medium- and long-term integrated development plan includes a strategy of increasing reservoir capacity and expanding land area: increasing the capacity upward by raising the existing cofferdam, and utilizing the aged qualified soil in the soil dumping area to create downward capacity.

[0013] In one possible implementation, in step S5, the medium- and long-term integrated development plan also includes: integrating wetland, road and lake island resources to create a cultural tourism product system, and planning and constructing low-carbon communities and developing green industries in the newly added land area.

[0014] In one possible implementation, the method is applicable to shallow silted lakes of different shapes and sizes, and can be divided into six-square or four-square grids for management according to the specific morphological characteristics of the lake.

[0015] Beneficial effects compared to existing technologies: 1. This scheme introduces the concept of a nine-square grid for zoned management, breaking down the massive and complex lake dredging project into multiple standardized units that can be implemented independently and sequentially. Sandbag cofferdam technology is used to construct a permanent composite structure that combines mud retention, roadbed, and ecological base functions. This enables the on-site, zoned, and classified resource utilization of dredged sludge, completely avoiding the high-cost steps of long-distance pipeline transportation, onshore solidification treatment, and secondary transfer of mud cakes required in traditional methods. Furthermore, utilizing undisturbed lakebed sand as cofferdam material significantly reduces construction costs and external resource consumption, fundamentally changing the situation of high costs and cumbersome procedures in traditional dredging projects. 2. This plan deeply integrates water conservancy dredging projects with regional transportation infrastructure construction, and uses the consolidated sandbag cofferdams directly as roadbeds to build a cross-lake transportation backbone network. This measure not only efficiently solves the spatial barrier caused by the large body of water to the coastal areas, significantly improving the efficiency of regional transportation connectivity and the flow of people and goods, providing physical support for regional integrated development, but also transforms the dredging temporary facilities, which are traditionally considered consumable projects, into permanent and valuable transportation assets, realizing the high-value transformation of engineering by-products and achieving synergistic effects between governance and development. 3. In this plan, water purification is enhanced by constructing a large-scale ecological wetland outside the cofferdam, and a new road network is used to activate the lake island and the landscape resources along the shore to develop a multi-functional tourism industry. The newly created land is also planned to be used to develop low-carbon industries. This systematically elevates lake management from end-of-pipe cleaning to the level of activating the ecological value of the entire basin and optimizing spatial functions. It provides a systematic solution for the long-term cleanliness of the lake and the sustainable development of the region, and achieves the organic unity of environmental, social and economic benefits. Attached Figure Description

[0016] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the Taihu Nine-Square Grid Zoning Plan of the present invention; Figure 2 This is a schematic diagram of the cross-section of the Taihu Lake cofferdam of the present invention; Figure 3 This is a schematic diagram of the connecting section of the Taihu Lake cofferdam separation area according to the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] The technical solutions in this application are designed to address the problems described in the background, and are generally as follows: Example

[0020] The following is in conjunction with the appendix Figures 1 to 3 Taking Taihu Lake in China as an example, this paper details a specific implementation method for comprehensively managing shallow and silted lakes using a nine-square grid approach, as provided by this invention. The specific steps are as follows: S1: Engineering Survey and Nine-Grid Zoning Planning This step aims to obtain basic data on the lake through surveying, and based on this, formulate a scientific and systematic "nine-square grid" zoning management plan, providing a foundation for all subsequent engineering design and construction. In practice, the first step is to conduct a comprehensive survey of the target lake, Taihu Lake. The survey covers three main aspects: hydrology, geology, and environment. The hydrological survey requires determining the lake's normal water level. The highest historical flood level Annual water level fluctuations, main flow direction and velocity In addition, wind and wave data are collected. Geological surveys utilize a gridded network of boreholes and sonar scans to obtain spatial distribution data of the lakebed sediment, including the thickness of the sediment in different areas. The physical properties and the depth and thickness of the underlying soil layer (especially the sandy layer) are crucial. Environmental investigation is the core, requiring the systematic collection of representative sediment samples. Based on the "Soil Environmental Quality Standard for Construction Land Soil Pollution Risk Control" (GB36600-2018) and the "Agricultural Sludge Pollutant Control Standard" (GB4284-2018), the focus should be on detecting heavy metals (such as lead). ,mercury ,cadmium ,chromium ), total nitrogen Total phosphorus Organic matter The content and pH value were used to draw a spatial distribution map of the pollution level of Taihu Lake sediment.

[0021] Based on the detailed data above, the "nine-square grid" zoning plan was initiated, such as... Figure 1 As shown. First, based on the distribution and thickness of sediment pollution, the core water area requiring focused remediation is delineated. (For example, Taihu Lake covers approximately 2000 square kilometers). Within this area, drawing inspiration from the nine-square grid layout, the lake is divided into nine relatively independent core governance blocks on a planar surface. The key to the planning lies in the "combination of solid and void" cofferdam layout: The red lines in the diagram represent schematic cofferdam lines (approximately 8km per segment), with solid lines later planned as roads; the dashed lines represent the boundary between the lake shore and the cofferdam, planned as tunnels or bridges; the cyan lines represent wetland boundaries; the pink lines represent existing roads; and the yellow lines represent planned artificial landscapes, beaches, and open-air bathing areas. The standard length of each solid cofferdam segment is shown in the diagram. The planned design is approximately 8 kilometers long, and the width of each individual earthwork area it encloses is... Approximately 1.25 kilometers. The total earthwork required for dredging the entire lake. The required total length of the cofferdam can be determined. The formula for calculating the total earthwork volume is as follows: ,in The average thickness of the planned dredging (e.g., 0.4 meters). The theoretical volume of a single standard stockpile area. Compared with the designed soil pile height Related, This ensures the total length of the solid cofferdam required for the dumping of dredged soil across the entire lake. It can be approximately estimated as This plan breaks down the massive lake management project into a series of standardized units that can be sequentially arranged and operated independently, thus achieving modular management of complex projects.

[0022] S2: Simultaneous construction of multi-functional sandbag dikes and ecological wetlands This step is a core engineering construction phase in implementing the nine-square grid zoning plan, aiming to utilize sandbag blowing technology to construct a permanent composite structure that combines silt containment, roadbed foundation, and ecological barrier functions. For example... Figure 2 As shown, this is a schematic diagram of the standard cross-sectional structure of a sandbag cofferdam, clearly demonstrating its engineering construction and design parameters. The cofferdam crest elevation... Determining the lake's normal water level is the primary design consideration, and it is essential to take into account the lake's normal water level. Factors such as flood season water level rise, wave height, and safety exceeding limits. Taking Taihu Lake as an example, the normal water level... =3.0m, Design cofferdam crest elevation =6.2m, then the height of the cofferdam above the water surface is... =3.2m, sufficient to withstand common winds and waves with a safety margin. The main body of the cofferdam is constructed using advanced sandbag blowing technology. During construction, large flexible bags made of high-strength polypropylene or polyester filament woven geotextile are used. A high-powered mud pump directly extracts sand-rich layers from the lake bottom as raw material, mixes them with water to form a slurry with a sand-to-water ratio of 1:3 to 1:5, and transports it through high-pressure pipelines to the geotextile bags pre-laid on the design axis. The geotextile has the characteristic of being "water-permeable but sand-impermeable." Under pressure, water in the slurry seeps out from the pores of the fabric, while sand particles are trapped inside the bags, gradually depositing, compacting, and consolidating to form high-strength sandbag units. Construction strictly follows the process specifications of layered blowing and staggered stacking, such as... Figure 2 As shown, the thickness of each layer of blown fill is strictly controlled to about 80 cm, and they are usually stacked. The cofferdam is constructed in 7 layers (e.g., 7 layers) to reach the design height, with a settlement allowance of approximately 10% in the design. The cofferdam cross-section is designed as a trapezoid, with a top width of... The width was set at 24 meters, a calculated width sufficient to meet the roadbed width requirements for future conversion into a two-way four-lane highway. After thorough drainage and consolidation, the sandbags' unconfined compressive strength... It can reach over 150 kPa, which fully meets the bearing capacity requirements of general highway subgrades, and no additional soft soil reinforcement treatment is required. This is the technical basis for the "road-weir integration" solution.

[0023] While constructing physical cofferdams, the construction of ecological wetland systems is carried out simultaneously, such as... Figure 1 The wetland boundary is marked by the medium-cyan line segment. Specifically, on both sides of the cofferdam (solid red line segment), soil generated from dredging and quickly tested on-site to determine compliance (pollutant content below standard limits) will be used to construct a boundary line of a certain width. A continuous wetland zone of at least 500 meters. Through meticulous topographic shaping, alternating shallow and deep subsurface flow wetlands, surface flow wetlands, and ecological ponds are formed, creating a multi-level purification system. Within this system, native aquatic plants such as reeds, calamus, Vallisneria natans, and Myriophyllum spicatum are scientifically planted. These plants have well-developed root systems that can effectively adsorb and absorb pollutants from the water. , The presence of nutrients and the resulting micro-ecological environment around the roots promote microbial biofilm formation and reproduction, further transforming pollutants through microbial degradation. The wetland substrate also physically traps and chemically precipitates suspended solids and some heavy metals. This continuous wetland surrounding each treated area constitutes a powerful in-situ ecological purification barrier, effectively filtering suspended solids generated during dredging operations and providing long-term, continuous purification of the lake water after the project concludes, achieving the ecological effect of "treating one area, purifying one area, and restoring one area."

[0024] S3: Zoned Dredging and Sludge Resource-Based Classification and Disposal This step involves the orderly, efficient, and environmentally friendly removal of polluted lakebed sediment under the dual protection of the constructed cofferdam and wetland. The dredging products are then meticulously classified and utilized for resource recovery. The dredging operation strictly adheres to the principle of "skipping grid construction," meaning that based on the pollution distribution map drawn in S1, priority is given to areas with thick sediment and severe pollution. For example, in… Figure 1 In the nine-square grid shown, diagonal or spaced-apart blocks can be selected for initial work, ensuring that no two adjacent blocks undergo large-scale underwater excavation simultaneously. This principle minimizes the risk of large-scale, prolonged water turbidity that might result from simultaneous construction across the entire lake, effectively controlling disturbance to the aquatic ecosystem during construction and achieving "dredging without water disturbance." The dredging operation utilizes an environmentally friendly cutter suction dredger. This vessel is equipped with an environmentally friendly cutter head that can gently cut the bottom mud and draw the mud-water mixture into the hull through a closed suction pipe, effectively controlling the spread of pollutants at the excavation point.

[0025] This invention employs a strategy of "nearby transportation, zoned stockpiling, and categorized disposal." The sludge sucked in by the dredger is directly and nearby transported through a sludge discharge pipeline composed of floating pipes on the water and shore pipes to the soil stockpile area enclosed by a pre-constructed sandbag cofferdam within the construction block (i.e.,...). Figure 1 (The area enclosed by the solid red line in the middle). This process completely eliminates the long-distance transportation, onshore solidification treatment, and secondary transfer of the solidified mud cake in traditional methods. After the silt enters the soil dumping area, it is managed by classification. First, in the middle of the soil dumping area, a grab dredger is used for partial excavation for two purposes: one is to obtain high-quality lake bottom sand for the dredging and filling of the cofferdam; the other is to perform preliminary leveling and zoning of the soil dumping area. The excavated soil is immediately subjected to rapid on-site testing to determine its pollution level according to national standards. Clean soil that passes the test is directly used as a resource for topographic shaping and backfilling of the ecological wetland outside the cofferdam as described in S2, realizing the internal recycling of the engineering soil. Heavily polluted silt that fails the test is guided to a designated area inside the soil dumping area, close to the inner side of the cofferdam, for centralized stockpiling. The cofferdam itself forms a physical isolation zone to limit high-risk pollutants to a controllable range. When a single soil dumping area is filled to the design elevation, the entire surface layer is covered with a thickness of A layer of clean, untreated soil or qualified soil at least 1 meter thick serves as a cover layer. This layer prevents surface pollutants from being stirred up by dust or migrated with rainwater runoff, while also providing favorable conditions for subsequent greening, landscaping, or short-term ecological restoration in the area. Through this process, the "tiered management, on-site disposal, and resource conversion" of dredged sludge are achieved, significantly reducing disposal costs and environmental risks.

[0026] S4: Construction of a cross-lake transportation network based on cofferdam roadbed This step innovatively transforms the byproduct of the remediation project—the solidified sandbag cofferdam—into regional infrastructure, constructing a cross-lake transportation network, thereby achieving a deep integration of ecological governance and regional development. Figure 3 The diagram clearly illustrates the connection methods of this transition node—the area separated by the cofferdam. It shows that the junction between the solid cofferdam and the natural lake shore, as well as the reserved "water flow channel" between two parallel solid cofferdams, all require specific structures to ensure road continuity. For the connection between the cofferdam and the lake shore, and for the wider "water flow channel," bridges or tunnels are typically used. Bridge options can utilize prefabricated assembly structures to reduce the impact of on-site operations on the water; tunnel options can employ shield tunneling or immersed tube methods to ensure the integrity of the lake landscape and unobstructed navigation.

[0027] In practice, the top width =24m, consolidated solid cofferdam ( Figure 1 The red solid line segment serves as the natural roadbed. The road surface structure layers (including base course and surface course) are then directly laid on top, forming a high-standard two-way four-lane highway. Connecting these dispersed "roadbed segments" through connecting structures creates a complete "two horizontal and two vertical" transportation backbone network across Taihu Lake. For example, the "two horizontal" segments could be cross-lake passages connecting Wuxi Binhu District, Suzhou Wuzhong District, and Suzhou Wujiang District; the "two vertical" segments could be passages connecting Wuxi Xinwu District to Huzhou Changxing County, and Suzhou Wuzhong District to Huzhou Wuxing District. Further optimization involves considering the approximately 1250-meter distance between the two parallel cofferdams, allowing for functional differentiation between the two parallel roads: one designed as a high-speed trunk line prioritizing traffic efficiency, primarily handling cross-regional passenger and freight transport; the other designed as a tourist and leisure road with lower speed limits, featuring viewing platforms, bicycle lanes, pedestrian paths, and service stations, specifically serving ecotourism and leisure sightseeing. Figure 1 The plan envisions a route connecting "artificial landscapes, beaches, and open-air bathing areas" (yellow line). This "separation of fast and slow traffic, complementary functions" transportation organization model not only meets the need for efficient regional connectivity but also fully explores and enhances the scenic and tourism value of the lake. Furthermore, utilizing existing consolidated cofferdams as roadbeds significantly reduces construction costs per kilometer and drastically shortens the construction period.

[0028] S5: Medium- and Long-Term Integrated Development Planning and Spatial Function Expansion This step focuses on the long-term, comprehensive benefits of the remediation project, systematically integrating functions and industrial planning into the new lake spatial pattern formed after the remediation, thereby promoting sustainable regional development. The planning primarily focuses on increasing reservoir capacity and expanding land space. Each earthwork area enclosed and filled by cofferdams actually creates new spatial value: the enclosed portion below the water surface becomes additional storage capacity, while the portion above the water surface forms additional land. The additional storage capacity of a single standard block... It can be approximated as For the entire project, the increased total reservoir capacity will significantly enhance Taihu Lake's flood control capacity and strategic water resource reserves. Addressing the inevitable need for repeated dredging (rotational dredging) during the lake's long-term operation, this embodiment employs a combined strategy of "upward expansion" and "downward space creation." In the long term, when the capacity of the soil-filling area approaches saturation, second- or even third-phase cofferdams can be constructed by increasing their height and thickness, expanding the soil-filling space upwards. Simultaneously, the aged soil within the soil-filling area, which has undergone years of natural degradation and whose pollutant indicators have stabilized and met standards, will be utilized for resource recovery, for example, as raw materials for producing permeable ecological bricks, roadbed fillers, and other environmentally friendly building materials. By "removing" this solidified soil from the soil-filling area, new storage space can be freed up at the bottom for storing new dredged sludge.

[0029] Secondly, implement in-depth integrated development of ecology, culture, and tourism. The resulting peripheral wetland ecological corridor (…) Figure 1 (cyan area), cross-lake transportation network (red solid line roads and connecting lines), and existing lake island resources ( Figure 1 (Central Islands), creating a diversified cultural tourism product system. Islands closer to transportation routes can be directly connected via branch roads, incorporating them into the lakeside tourism circle; islands further away can be planned with water transportation routes, transforming them into themed scenic islands, ecological bird islands, or leisure sports bases. Figure 1 In the center, yellow lines mark the locations of planned artificial landscapes, beaches, and open-air bathing areas, which, together with wetlands and roads, will form the "Taihu Lake Ecological Gallery." Furthermore, at easily accessible and scenic locations, such as... Figure 1 Near the intersection of the existing road and the newly built ring road around the lake, represented by the pink line segment, cultural facilities such as the "Taihu Lake Core Museum" are planned to be built to systematically showcase the geological history, water conservancy culture, ecological changes and governance achievements of Taihu Lake.

[0030] Finally, promote the development of low-carbon industries and the circular economy. In newly formed land areas (such as the top of some excavated areas and the developable areas along the cofferdam roadbed), plan and construct low-carbon smart communities such as "Waterfront Taihu City". These communities will adopt high-performance green building standards, integrating solar photovoltaic power generation, rainwater harvesting and greywater reuse systems, and equipped with charging facilities to create near-zero carbon demonstration zones. Utilize the dredged and deepened main channel to upgrade and transform lakeside ports and wharves, developing modern ecological shipping and green logistics industries. Focusing on wetland maintenance, silt resource utilization technology, and aquatic ecological restoration, cultivate specialized environmental technology companies and industrial chains, transforming the technical experience accumulated from governance projects into industrial development momentum, ultimately achieving a leap from "single lake management" to "lake management for urban development and ecological prosperity for the people," providing continuous green power for the high-quality integrated development of the Yangtze River Delta.

[0031] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for comprehensive management of shallow, silted lakes using a nine-square grid system, characterized in that: Includes the following steps: S1: Conduct an engineering survey of the target lake to obtain data on the distribution and pollution status of bottom sediment, and based on this data, plan the water area of ​​the lake that needs to be treated into nine core blocks, and set up cofferdams using a combination of virtual and real layout methods. S2: Construct a sandbag cofferdam at the planned solid cofferdam axis, and at the same time build an ecological wetland system outside the cofferdam; S3: Dredging operations are carried out according to the principle of zoned and grid-skipping construction. The dredged silt is transported to the area enclosed by the cofferdam of the corresponding block, and the silt is classified, disposed of and utilized as a resource. S4: Use the consolidated solid sandbag cofferdam as the roadbed to construct a cross-lake transportation network; S5: To develop a medium- to long-term integrated development plan for the reservoir capacity, land area, and transportation network formed after the remediation, and to expand the ecological, cultural tourism, and industrial functions.

2. The method for comprehensive management of shallow, silted lakes by using a nine-square grid partitioning system as described in claim 1, characterized in that... In step S1, the layout of combining physical and virtual elements is as follows: physical cofferdams form the boundaries of each core block, water flow channels are reserved between adjacent physical cofferdams, and the physical cofferdams are planned as permanent structures that combine the functions of silt blocking during the dredging period and the function of roadbed for traffic in the later period.

3. The method for comprehensive management of shallow, silted lakes by using a nine-square grid partitioning system as described in claim 1, characterized in that... In step S2, the sandbag cofferdam is constructed using a layered dredging process, with the raw materials taken from the rich sand layer at the bottom of the lake. The top width of the cofferdam is... To meet the roadbed width requirements for later stages, the cofferdam crest elevation... According to the lake's normal water level And wind and wave conditions settings.

4. The method for comprehensive management of shallow, silted lakes by using a nine-square grid partitioning system as described in claim 1, characterized in that... In step S2, the ecological wetland system is constructed outside the solid cofferdam, using qualified soil generated from dredging to fill the area, and aquatic plants are planted within the wetland to purify the water.

5. The method for comprehensive management of shallow, silted lakes by using a nine-square grid partitioning system as described in claim 1, characterized in that... In step S3, the classification, disposal and resource utilization specifically include: conducting on-site testing of the dredged soil, using qualified soil for wetland construction, and centrally stockpiling unqualified silt in a designated area inside the cofferdam, and covering the surface of the stockpiled area with a clean covering layer.

6. The method for comprehensive management of shallow, silted lakes by using a nine-square grid partitioning system as described in claim 1, characterized in that... In step S4, the construction of the cross-lake transportation network specifically includes: laying a road surface structure layer on top of the solidified cofferdam to form a road, and connecting the cofferdam with the lake shore and the water flow channels connecting adjacent cofferdams through bridge or tunnel structures to form a main transportation line that runs through the lake.

7. The method for comprehensive management of shallow, silted lakes by using a nine-square grid partitioning system as described in claim 6, characterized in that... The transportation network comprises a system of multiple parallel roads, of which at least one road is planned as a fast artery and another road is planned as a tourist and sightseeing slow road.

8. The method for comprehensive management of shallow, silted lakes by using a nine-square grid partitioning system as described in claim 1, characterized in that... In step S5, the medium- and long-term integrated development plan includes reservoir capacity enhancement and land expansion strategies: increasing the capacity upward by raising the existing cofferdam, and utilizing the aged qualified soil in the soil dumping area to create downward capacity.

9. The method for comprehensive management of shallow, silted lakes by using a nine-square grid partitioning system as described in claim 1, characterized in that... In step S5, the medium- and long-term integrated development plan also includes: integrating wetland, road and lake island resources to create a cultural tourism product system, and planning and constructing low-carbon communities and developing green industries in the newly added land area.

10. A method for comprehensive management of shallow, silted lakes using a nine-square grid partitioning system as described in any one of claims 1 to 9, characterized in that... The method is applicable to shallow silted lakes of different shapes and sizes. Different variations of the eight-square grid, six-square grid, or four-square grid can be used for zoned management according to the specific morphological characteristics of the lake.

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